Here is a sharp looking American Bosch MJB4A106 base mount clockwise magneto.It has a 20 degree adjustable timing range lever that can be employed or simply left in the full advance position with a 35 degree impulse lag as it has an impulse coupler. It was configured for the early McCormick Deering tractors as the 1020,1530 and others. It has been completely disassembled, blasted, primed and painted, bearings washed and repacked,magnets recharged, components tested to factory specs and replaced as necessary,new gasket, threads chased. It has been professionally bench tested and is good and hot as it should be. It is for many early engines and tractors per the American Bosch applications manual. Check your parts and service manual to be sure.May return in 10 days if not pleased, payment due in 5 days, will ship postpaid to US addresses. Any questions, please ask the old croaker at oldcroak vintage ignition.